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Detailed comparison between sunspot activity in ‘hot spots’ and galactic cosmic-ray intensity

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Abstract

The influence of sunspot activity on the condition of the solar-terrestrial environment during cycle 21 was examined using the data of sunspots and the modulation of the galactic cosmic-ray intensity. The ‘hot spots’ discussed by Ichimoto et al. (1985) and Bai (1987a, 1988) were also found by analyzing the longitudinal distribution of sunspot groups.

A detailed comparison between the time change of the sunspot activity in hot spots and that of the galactic cosmic rays observed by the neutron monitor reveals that several transient diminutions of the GCR intensity (with much longer duration than a Forbush decrease) occur at nearly the same time as the sporadic enhancement of sunspot area in the hot spots.

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Author notes

  1. M. Akioka

    Present address: Hiraiso Solar Terrestrial Research Center, Communication Research Laboratory, Ministry of Post and Telecommunications, Isozaki 3601, Nakaminato, 311-12, Ibaraki, Japan

Authors and Affiliations

  1. Kwasan and Rida Observatories, Faculty of Science, Kyoto University, Sakyo-ku, 606, Kyoto, Japan

    M. Akioka & J. Kubota

  2. Kawagoe High School, Kawagoe, 512, Mie, Japan

    M. Suzuki

  3. Osaka Prefectural College of Technology, Neyagawa, 572, Osaka, Japan

    I. Tohmura

Authors
  1. M. Akioka
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  2. J. Kubota
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  3. M. Suzuki
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  4. I. Tohmura
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Contributions from Kwasan and Hida Observatories, Kyoto University No. 303.

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Akioka, M., Kubota, J., Suzuki, M. et al. Detailed comparison between sunspot activity in ‘hot spots’ and galactic cosmic-ray intensity. Sol Phys 139, 177–187 (1992). https://doi.org/10.1007/BF00147888

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  • DOI: https://doi.org/10.1007/BF00147888

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